Describe the bug

go version go1.24.3 linux/amd64

These bug ocassionally happens. We got a segfault when call golang.NewIndex with correct parameter {0, 2, 128, 0, 0, 0, false}

SIGSEGV: segmentation violation
PC=0x7ff4a394b242 m=19 sigcode=1 addr=0x15c6
signal arrived during cgo execution

goroutine 35218 gp=0xc00be2bdc0 m=19 mp=0xc001001008 [syscall]:
runtime.cgocall(0x401c3a0, 0xc00acc2c18)
/data/xupeng/code/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.3.linux-amd64/src/runtime/cgocall.go:167 +0x4b fp=0xc00acc2bf0 sp=0xc00acc2bb8 pc=0x47e0cb
github.com/unum-cloud/usearch/golang._Cfunc_usearch_init(0xc02b7dc980, 0xc0384cae08)
_cgo_gotypes.go:414 +0x47 fp=0xc00acc2c18 sp=0xc00acc2bf0 pc=0x1a58067
github.com/unum-cloud/usearch/golang.NewIndex.func1(...)
/data/xupeng/code/pkg/mod/github.com/unum-cloud/usearch/golang@v0.0.0-20250207215718-306d6646b8f5/lib.go:180
github.com/unum-cloud/usearch/golang.NewIndex({0x0, 0x2, 0x80, 0x0, 0x0, 0x0, 0x0})
/data/xupeng/code/pkg/mod/github.com/unum-cloud/usearch/golang@v0.0.0-20250207215718-306d6646b8f5/lib.go:180 +0x245 fp=0xc00acc2c98 sp=0xc00acc2c18 pc=0x1a59145
github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.NewHnswBuildIndex({0xc038c9701a, 0x6}, {{0x53b02d9, 0x4}, {0x0, 0x2, 0x80, 0x0, 0x0, 0x0, ...}, ...}, ...)
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:68 +0xa5 fp=0xc00acc2ce0 sp=0xc00acc2c98 pc=0x34fb465
github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.(*HnswBuild).getIndexForAdd(0xc0131c7ba0)
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:351 +0x33e fp=0xc00acc2e30 sp=0xc00acc2ce0 pc=0x34fcfde
github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.(*HnswBuild).getIndexForAddSync(0x48b6420?)
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:343 +0x99 fp=0xc00acc2e90 sp=0xc00acc2e30 pc=0x34fcbb9
github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.(*HnswBuild).addVectorSync(0xc0477bc720?, 0x2630, {0xc029cc3e00, 0x80, 0x80})
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:388 +0x27 fp=0xc00acc2ed0 sp=0xc00acc2e90 pc=0x34fd107
github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.(*HnswBuild).addFromChannel(0xc0131c7ba0, 0xc03abbea80)
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:286 +0xd6 fp=0xc00acc2f80 sp=0xc00acc2ed0 pc=0x34fc536
github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.NewHnswBuild.func1()
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:259 +0x7e fp=0xc00acc2fe0 sp=0xc00acc2f80 pc=0x34fc37e
runtime.goexit({})
/data/xupeng/code/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.3.linux-amd64/src/runtime/asm_amd64.s:1700 +0x1 fp=0xc00acc2fe8 sp=0xc00acc2fe0 pc=0x48a361
created by github.com/matrixorigin/matrixone/pkg/vectorindex/hnsw.NewHnswBuild in goroutine 34912
/home/xupeng/github/matrixone/pkg/vectorindex/hnsw/build.go:254 +0x2b0

Steps to reproduce

IndexConfig = {0, 2, 128, 0, 0, 0, false}

call usearch.NewIndex(IndexConfig{usearch.F32, usearch.L2sq, 128, 0, 0, 0, false})

It is not always reproducible.

Expected behavior

empty index returns without error.

USearch version

v2.17.1

Operating System

Ubuntu 22.04

Hardware architecture

x86

Which interface are you using?

Other bindings

Contact Details

cpegeric@gmail.com

Are you open to being tagged as a contributor?

• I am open to being mentioned in the project .git history as a contributor

Is there an existing issue for this?

• I have searched the existing issues

Code of Conduct

• I agree to follow this project's Code of Conduct